You've used free WiFi to access sensitive information
“Free, unsecured WiFi at your local coffee shop is awfully convenient. Unfortunately, it’s easy for someone to spy on everything you do on there. If you are going to use unsecured WiFi, the best way to do it is to use a VPN (virtual private network) service to keep your connection secure. These are inexpensive and keep you safe. If you’re not going to do that, then be sure to never sign on to a bank website, and try to stay off your email as well. If you are going to check your email, always watch the address bar. Is the website correct? The website should say ‘https://’ instead of ‘http://’ as that added ‘s’ indicates a secure connection. There should also be a green lock symbol next to the URL. If you don’t have those indicators of a secure connection, do not put in any of your login information.” –Matthew Woodley, Woodley Digital Marketing
You're getting blocked
“You may also see your legitimate emails get blocked by other parties’ spam filters because your communications now look like they’re coming from a suspicious source.” –Mike Tanenbaum, Cyber Head for Chubb North America.
You're getting charged for transactions you didn't make
“Your bank sends you an SMS alert about a transaction that you didn’t do. Or you get a statement from your credit card company stating that you bought something that you never actually purchased.” –George Waller, CEO of BlockSafe Technologies and StrikeForce Technologies, Inc.